CN109591646B - Vehicle-mounted end parallel protection circuit suitable for LCL/LCC topology wireless charging system - Google Patents
Vehicle-mounted end parallel protection circuit suitable for LCL/LCC topology wireless charging system Download PDFInfo
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- CN109591646B CN109591646B CN201811552109.0A CN201811552109A CN109591646B CN 109591646 B CN109591646 B CN 109591646B CN 201811552109 A CN201811552109 A CN 201811552109A CN 109591646 B CN109591646 B CN 109591646B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The invention discloses a vehicle-mounted end parallel protection circuit suitable for an LCL/LCC topology wireless charging system, and belongs to the technical field of wireless charging and safe charging of electric automobiles. The protection circuit comprises a voltage sensor, a current sensor, a protection control circuit and a relay, wherein the normally open relay is connected in parallel at the output end of the LCL/LCC topology, the protection control circuit judges whether overvoltage or overcurrent occurs in the charging process according to the collected charging voltage and charging current of the vehicle-mounted battery, so as to control the on-off state of the relay, and in addition, the wireless communication module contained in the protection control circuit sends a power supply starting or stopping instruction to the ground end power supply. The protection circuit is suitable for a wireless charging system requiring fast protection response, and when the electric automobile has abnormal conditions of overcurrent and overvoltage in the charging process, the protection circuit can timely protect the electric automobile and ensure the safety of the whole system; the protection circuit of the invention has lower input cost, stronger reliability of the control method and strong practicability.
Description
Technical Field
The invention discloses a vehicle-mounted end parallel protection circuit suitable for an LCL/LCC topology wireless charging system, and belongs to the technical field of wireless charging and safe charging of electric automobiles.
Background
Along with the rapid development of electric vehicles, the wireless charging technology of the electric vehicles is applied, the electric vehicles are not required to be charged in a plug-in charging gun mode, the electric vehicles can be charged after reaching a specified charging area and sending a charging starting instruction to a ground end power supply through a wireless communication module, and the wireless charging system is automatically cut off after the batteries are fully charged. How to ensure the charging safety of the electric automobile and timely cut off the wireless charging system when abnormal conditions such as overvoltage, overcurrent and the like occur has become a hot problem for research of experts and scholars at home and abroad. At present, the protection of the wireless charging system of the electric vehicle generally sends a protection command to a ground terminal through a vehicle-mounted terminal, and then a power supply is turned off.
Disclosure of Invention
The invention aims to overcome the defects of the background technology, provides a vehicle-mounted end parallel protection circuit suitable for an LCL/LCC topology wireless charging system, realizes the quick response of the protection circuit, and solves the technical problem of safe charging of an electric vehicle.
The invention adopts the following technical scheme for realizing the aim of the invention:
the vehicle-mounted end parallel protection circuit suitable for the LCL/LCC topological wireless charging system is characterized in that an LCL/LCC compensating topological structure is adopted by a secondary side compensating network of the wireless charging system, and the vehicle-mounted end parallel protection circuit comprises: the protection circuit comprises a voltage sensor, a current sensor, a protection control circuit and a switch relay; the voltage sensor and the current sensor respectively collect charging voltage and charging current of the vehicle-mounted battery and send the collected charging voltage and charging current to the protection control circuit; the protection control circuit controls the on-off state of the relay by judging whether the vehicle-mounted end has overvoltage or overcurrent in the charging process, the protection control circuit also comprises a wireless communication module used for being in real-time communication with a ground end power supply, the protection control circuit sends a power supply starting or stopping instruction to the ground end power supply through the wireless communication module of the protection control circuit, and the ground end wireless communication module starts or stops power supply after receiving the instruction sent by the protection control circuit; the relay is connected in parallel at the output end of the LCL/LCC topology, and the switch relay selects a normally open relay.
Preferably, the protection control circuit mainly comprises a first comparator, a second comparator and an MOS transistor. The output end of the current sensor is connected to the + end of the first comparator, and the-end of the first comparator is a set overcurrent protection value; the output end of the voltage sensor is connected to the positive end of the second comparator, and the negative end of the second comparator is a set overvoltage protection value; the output ends of the first comparator and the second comparator are connected to the grid electrode of the MOS tube; VCC is connected with one end of a normally open relay coil, and the other end of the relay coil is connected with the drain electrode of the MOS tube; the source electrode of the MOS tube is grounded together with the ground ends of the first comparator and the second comparator.
Preferably, the protection control circuit further comprises a first wireless communication module, the first wireless communication module is in real-time communication with a second wireless communication module at the ground end, when the electric vehicle reaches a designated charging area, the first wireless communication module sends a charging start instruction to the ground end power supply, and when the vehicle-mounted end is in an abnormal condition of overcurrent or overvoltage, the first wireless communication module sends a charging stop instruction to the ground end power supply.
The working process of the vehicle-mounted end parallel protection circuit suitable for the LCL/LCC topology wireless charging system is as follows:
(1) when the electric automobile is normally charged, the vehicle-mounted end charging voltage and the charging current which are acquired in real time are both smaller than the set reference value, the first comparator and the second comparator output low levels, the MOS tube is in a turn-off state, the coil of the relay is in a power-off state, and the switch of the relay is kept in a normally-open state;
(2) when the electric automobile is in the abnormal condition of overvoltage or overcurrent in the charging process, the first comparator or the second comparator outputs a high level, the MOS tube is conducted, the coil of the relay is electrified, the switch of the relay is changed from a normally open state to a normally closed state, the vehicle-mounted end battery connected to the output end of the wireless charging system is cut off, and meanwhile, the first wireless communication module sends a charging stopping instruction to the ground end power supply.
By adopting the technical scheme, the invention has the following beneficial effects: the vehicle-mounted end parallel protection circuit suitable for the LCL/LCC topology wireless charging system perfectly combines the wireless charging technology and the safe charging control technology of the electric vehicle, so that the electric vehicle can be charged safely and reliably in a wireless mode; in order to ensure that the wireless charging system can run in a no-load mode after the relay cuts off a vehicle-mounted end battery, the system adopts an LCL/LCC topology as a secondary compensation network; the circuit can realize the protection of the vehicle-mounted end battery only by using devices such as a comparator, a relay and the like, has lower input cost, quicker protection action, stronger reliability and strong practicability.
Drawings
Fig. 1 is a vehicle-mounted terminal parallel protection circuit applicable to an LCL/LCC topology wireless charging system according to the present invention.
Detailed Description
The vehicle-mounted end parallel protection circuit suitable for the LCL/LCC topology wireless charging system, as shown in fig. 1, comprises: voltage sensor, current sensor, protection control circuit, relay, protection control circuit includes: comparator 1, comparator 2, MOS pipe, wireless communication module 1, the relay is normally open switch relay.
The voltage sensor and the current sensor respectively collect charging voltage and charging current of the vehicle-mounted battery, the output end of the current sensor is connected to the + end of the comparator 1, and the-end of the comparator 1 is a set overcurrent protection value; the output end of the voltage sensor is connected to the + end of the comparator 2, and the-end of the comparator 2 is a set overvoltage protection value; the output ends of the comparator 1 and the comparator 2 are connected to the G pole of the MOS tube; the power supply VCC is connected with one end of a coil of the normally open relay, and the other end of the coil of the relay is connected with the D pole of the MOS tube; the S pole of the MOS tube is connected with the ground ends GND of the comparator 1 and the comparator 2.
The protection control circuit also comprises a wireless communication module 1. The wireless communication module 1 is in real-time communication with the ground end wireless communication module 2, and when the electric automobile reaches a specified charging area, the wireless communication module 1 sends a charging starting instruction to a ground end power supply; when the vehicle-mounted end has an overcurrent or overvoltage abnormal condition, the wireless communication module 1 sends a charging stop instruction to the ground end power supply.
The working process of the protection circuit comprises the following steps:
(1) when the electric automobile is normally charged, the vehicle-mounted end charging voltage and current which are collected in real time are both smaller than a set reference value, the comparator 1 and the comparator 2 both output low levels, the MOS tube is in a turn-off state, the coil of the relay is in a power-off state, and the switch of the relay is kept in a normally-open state;
(2) when the electric automobile is in the abnormal condition of excessive pressure or overcurrent in the charging process, comparator 1 or comparator 2 output high level, and the MOS pipe is led on, and the coil circular telegram of relay, the switch of relay become normally closed state by normally open state, the excision connects the on-vehicle end battery at wireless charging system output, and simultaneously, wireless communication module 1 sends the instruction that stops charging to ground end power supply.
In order to ensure that the wireless charging system can still safely operate under the no-load condition after the relay acts, a secondary compensation network of the wireless charging system can adopt an LCL compensation topology. The vehicle-mounted end protection circuit is also applicable to a wireless charging system with an LCC topology as a secondary side compensation network.
Claims (3)
1. Be applicable to the wireless charging system's of LCL/LCC topology on-vehicle end parallel protection circuit, wireless charging system secondary side compensation network is LCL/LCC topology, its characterized in that includes:
a voltage sensor for collecting the charging voltage of the vehicle-mounted battery,
a current sensor for collecting the charging current of the vehicle-mounted battery,
a normally open relay, the controlled element of which is connected in parallel with the output port of the secondary compensation network of the wireless charging system, and is kept in a normally open state when the receiving coil is not connected to the charging loop, and is switched to a normally closed state when the receiving coil is connected to the charging loop and the voltage at the two ends of the receiving coil reaches the action threshold value, and,
and a protection control circuit, the input end of which is connected with the charging voltage collected by the voltage sensor and the charging current collected by the current sensor, the charging circuit of the power receiving coil is switched on when the charging current exceeds a current setting threshold value or the charging voltage exceeds a voltage setting threshold value, and the charging circuit of the power receiving coil is switched off when the charging current does not exceed the current setting threshold value and the charging voltage does not exceed the voltage setting threshold value.
2. The vehicle-mounted end parallel protection circuit suitable for the LCL/LCC topology wireless charging system according to claim 1, wherein the protection control circuit comprises:
a first comparator, the input end of which is connected with the charging current collected by the current sensor and outputs the comparison result of the charging current and the current setting threshold value,
a second comparator, the input end of which is connected with the charging voltage collected by the voltage sensor and outputs the comparison result of the charging voltage and the voltage setting threshold value, and,
MOS tube connected in series in the charging loop of the normally open relay receiving coil, the grid of the MOS tube is connected with the output end of the first comparator and the output end of the second comparator, the drain of the MOS tube is connected with the normally open relay receiving coil, and the source of the MOS tube is grounded with the first comparator and the second comparator together.
3. The vehicle-mounted terminal parallel protection circuit suitable for the LCL/LCC topology wireless charging system of claim 1, wherein the protection control circuit further comprises a wireless communication module for real-time communication with a ground terminal power supply, and the wireless communication module sends a charging start instruction to the ground terminal power supply after the electric vehicle reaches a designated charging area, and sends a charging stop instruction to the ground terminal power supply when an overcurrent condition or an overvoltage condition occurs at the vehicle-mounted terminal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811552109.0A CN109591646B (en) | 2018-12-19 | 2018-12-19 | Vehicle-mounted end parallel protection circuit suitable for LCL/LCC topology wireless charging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811552109.0A CN109591646B (en) | 2018-12-19 | 2018-12-19 | Vehicle-mounted end parallel protection circuit suitable for LCL/LCC topology wireless charging system |
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| CN109591646A CN109591646A (en) | 2019-04-09 |
| CN109591646B true CN109591646B (en) | 2020-05-29 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112389216A (en) * | 2019-07-31 | 2021-02-23 | 北京新能源汽车股份有限公司 | Vehicle wireless charging control method, vehicle-end controller and wireless charging system |
| CN112583088A (en) * | 2019-09-27 | 2021-03-30 | 北京新能源汽车股份有限公司 | Electric automobile end charging circuit and current and voltage control method thereof and automobile |
| CN111186319A (en) * | 2020-02-21 | 2020-05-22 | 东南大学 | Vehicle-mounted end equipment protection device and method for wireless charging system of electric vehicle |
| CN114179644A (en) * | 2020-09-15 | 2022-03-15 | 北京新能源汽车股份有限公司 | Wireless charging control method and device and vehicle |
| CN114179647A (en) * | 2020-09-15 | 2022-03-15 | 北京新能源汽车股份有限公司 | Wireless charging control method and device and vehicle |
| CN114179645A (en) * | 2020-09-15 | 2022-03-15 | 北京新能源汽车股份有限公司 | Wireless charging control method and device and vehicle |
| CN112564300B (en) * | 2020-12-03 | 2023-05-26 | 维沃移动通信有限公司 | Wireless charging receiving end, method and device and electronic equipment |
| CN114024375B (en) * | 2021-11-25 | 2024-02-13 | 桔充充(杭州)新能源有限公司 | Fault self-protection circuit and method for wireless charging system of two-wheeled electric vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105071511B (en) * | 2015-07-28 | 2017-10-13 | 王稀猛 | A kind of wireless charging system for electric automobile |
| JP6183446B2 (en) * | 2015-12-25 | 2017-08-23 | マツダ株式会社 | Lithium ion battery charge / discharge controller |
| CN106532845B (en) * | 2016-12-08 | 2019-03-01 | 东南大学 | A kind of battery wireless charging system of pair side combined type compensation network |
| JP2018170847A (en) * | 2017-03-29 | 2018-11-01 | 三菱自動車工業株式会社 | Electric-vehicular current monitor apparatus |
| CN208226592U (en) * | 2017-12-28 | 2018-12-11 | 贺州学院 | A kind of wireless electric vehicle charging device |
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